A series of crashes caused traffic chaos between Harrogate and Otley at rush hour on Monday morning.
The first, on the B6161 at Leathley, saw a car spin out of control and crash at 8.20am. No other vehicles were involved, say police.
Minutes later, at Stainburn, a second crash saw a tractor overturn outside Hill Top Farm. Police say the driver was uninjured.
The road remained closed for much of the morning, with long queues backing up in both directions.